CL-SOM-IMX6

Ajay3 — Fri, 02 Oct 2020 14:35:42 GMT

I am trying to receive a string on UART 2 of CL-SOM-iMX6, in the serial boot-up logs i am able to see that ttymxc1/ttymxc2/ttymxc3/ttymxc4 enabled but i am not able to read any incoming data .

in the .dtsi file i am setting the status = "okay" for UART2/UART3/UART4/UART5

serial console -

imx6q-pinctrl 20e0000.iomuxc: pin MX6Q_PAD_EIM_D27 already requested by 20e0000.iomuxc; cannot claim for 21e8000.serial
imx6q-pinctrl 20e0000.iomuxc: pin-48 (21e8000.serial) status -22
imx6q-pinctrl 20e0000.iomuxc: could not request pin 48 (MX6Q_PAD_EIM_D27) from group uar2grp on device 20e0000.iomuxc
imx-uart 21e8000.serial: Error applying setting, reverse things back
21e8000.serial: ttymxc1 at MMIO 0x21e8000 (irq = 291, base_baud = 5000000) is a IMX
21ec000.serial: ttymxc2 at MMIO 0x21ec000 (irq = 292, base_baud = 5000000) is a IMX
21f0000.serial: ttymxc3 at MMIO 0x21f0000 (irq = 293, base_baud = 5000000) is a IMX
console [ttymxc3] enabled
21f4000.serial: ttymxc4 at MMIO 0x21f4000 (irq = 294, base_baud = 5000000) is a IMX

pin configurations in .dtsi -

/* pins for ttymxc1 */
pinctrl_uart2: uar2grp {
fsl,pins = <
MX6QDL_PAD_EIM_D27__UART2_TX_DATA 0x1b0b1
MX6QDL_PAD_EIM_D27__UART2_RX_DATA 0x1b0b1
>;
};

/* pins for ttymxc2 */
pinctrl_uart3: uar3grp {
fsl,pins = <
MX6QDL_PAD_EIM_D24__UART3_TX_DATA 0x1b0b1
MX6QDL_PAD_EIM_D25__UART3_RX_DATA 0x1b0b1
>;
};

/* pins for ttymxc3 console */
pinctrl_uart4: uart4grp {
fsl,pins = <
MX6QDL_PAD_KEY_COL0__UART4_TX_DATA 0x1b0b1
MX6QDL_PAD_KEY_ROW0__UART4_RX_DATA 0x1b0b1
>;
};

I am able to see the square wave on oscilloscope when I transmit the string by placing probes on the hardware lines, i want to view the same character on the serial console , I am not able to see the characters that are received .

Can anyone please tell me what all changes I have to do or the steps to follow to achieve it ?

Re: CL-SOM-IMX6

Ajay3 — Mon, 05 Oct 2020 06:52:37 GMT

Hi Igor,

I have tried using "cat" to read from ttymxc1, it's sort of in a hang state , in the sense nothing is read from ttymxc1.

Is there any other UART configuration changes that have to be done?

Re: CL-SOM-IMX6

igorpadykov — Mon, 05 Oct 2020 10:40:35 GMT

Hi Ajay3

this board was developed and supported by compulab, suggest to post issue

on its support portal:

https://mediawiki.compulab.com/w/index.php?title=Support

Best regards
igor

i.MX ProcessorsのトピックCL-SOM-IMX6

CL-SOM-IMX6

Re: CL-SOM-IMX6

Re: CL-SOM-IMX6

Re: CL-SOM-IMX6